During May 2011 four planets gathered in the sky, that’s known in astronomy as a “conjunction”. There were infinite conjunctions during may as the planets moved along the ecliptic showing many different configurations. The event favored observers in the southern hemisphere as the planets were higher in the sky and the nights are longer during May. The first photo shows Jupiter (top) and Venus just before sunrise, daylight made the other planets fade but Jupiter & Venus were still very bright.
In this super-wide view bright Venus is still shining in the sky even if only a few minutes before sunrise. The waves are from a river: Rio de La Plata, the widest river on Earth. In a windy day the river can be quite similar to the ocean choppy and wavy.
At the beginning of the Month we had Venus high in the sky with Mercury on the side. Jupiter and fainter Mars are below. It’s quite a sight to see Mercury that high in the sky and during the night and that is only possible in the south hemisphere where Mercury is further away from the Sun and the sky is dark at 6am.
The same configuration from May 5th at Dawn. Venus and Mercury at the top with Jupiter and Mars below them. Jupiter is going to rise fast later in May.
By the middle of May (15th) Jupiter was high in the Sky, Venus, Mars and Mercury gathered below, starts from Pisces and Cetus are also visible in the photo.
One week later Jupiter was escaping fast from the conjunction while Venus, Mercury and Mars were shining even a few minutes before sunrise. In this photo some thin clouds were covering the sky and the first light of the morning lit them in several colors. Venus is so bright that it can shine thru the cloud layer.
On May the 28th the thin Moon joined the Conjunction. Jupiter, Venus and Mars follow the moon in a straight line. Mercury was still below the horizon. Several stars from Pisces, Aries, Cetus and Triangulum are visible in the photo. There is a small satellite trail just in the middle of an asterism known as “the circlet” in Pisces. If you look close you will see the stars make a circle with the satellite trail just in the middle of it.
At the end of the month, May 31st the moon was very thin and on the side of the 4-way conjunction. The four planets are in a straight line here, Jupiter is at the top left and then Mars, Venus and Mercury.
A few minutes earlier only Jupiter had risen from the Eastern horizon and the moon was a lot brighter, they formed a beautiful conjunction in the sky.
The last photo is from May 31st just seconds before sunrise. The thin Moon and Venus are still visible and the first rays of sunlight coming from below the horizon create a shadow in the sky. The last display of a nice set of planetary conjunctions.
I have more images from the Conjunctions on a special set in my website:
http://www.luisargerich.com/may2011
And a Slide show:
http://www.luisargerich.com/conjunctions-2011
One of the photos was published as NASA’s Astronomy Photo of the Day:
http://apod.nasa.gov/apod/ap110507.html










Awesome series of photos!!!
De uma beleza sem igual! Fiquei emocionada.